This is a point I keep making. Hell, growing up men will even mock each other for eating vegetables with phalic shapes. We're told from a very early age that any penis other than our own is bad. On the opposite side, we also learn from an early age that we're supposed to appreciate the female form - including the female genital. Of course, women don't go through the same experience. Maybe that's why so many FtM fail to realize that we aren't being conditioned to like penis. Maybe they were pressured by society and family to like and date men, but for actual cis men this isn't the case. We like men and we like penis despite of what society tells us.

The "it's a social construct so it's bad" justification never explains why it's bad for something to be a social construct. These people act like they're Mowgli out there, totally unaffected by society. Of course, neo-sexualities aren't considered a social construct by them, I guess they found the word "genderqueer" hanging in a tree or something. And they also can't give a good explanation on what would be an alternative, if feeling attraction to sex based on genitals is a social construct.

Sometimes they say you feel attraction based on the person's self-identification. Obviously that wouldn't work, unless you only feel attraction after someone states their gender.

Sometimes they say you feel attraction based on the gender expression. Of course, it's ridiculous to say features like hair and clothings are less of social constructs than your genitals.

In the end of the day, sure, homosexuality is a social construct to a level. Over time society created this word and decided to associate it with genitals. But how is it any better and any less of an arbitrary social construct to associate other features with this word?